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### Constructing a Best Fit or Best Fit Recompensate Slot

The Best Fit (BF) and the Best Fit Recompensate (BFRE) are constructed from four or more features. The constructed slots vector is normal (perpendicular) to the workplane. The BFRE construction uses the ball center combined with the probe radius to compute the slot. The compensation is an integral part of the fitting. The BF construction compensates the measured points prior to fitting.

The height of the slot from the workplane is the average of all the input features.

To construct a BF or BFRE slot:

1. Access the Construct Slot dialog box (Insert | Feature | Constructed | Slot).

2. Select In or Out.

3. Select the BF or BFRE option.

4. Select at least four features. They can be any feature type.

For Best Fit (BF) or Best Fit Recompensate (BFRE) constructions, while you can use any feature type for your input features, BF and BFRE fit types are typically used with point features or point sets (a scan of points, a feature set with points, or an expression that resolves to an array of points).

5. Click the Create button.